Inherent with their design, the OAT coolants last longer than the older traditional IAT coolants. OAT coolants prevent this metal-oxide layer that protects the surface against this corrosion. Aluminium and ferrous metals form a surface-layer of corrosion in the presence of moisture, even with the little bit of moisture in the air. The newer OAT coolants work differently than the older silicate based IAT coolants. This type can be used on all mixed metal engines with components including steel, cast iron, copper, brass, aluminium and solder without any detrimental effect. The additives deplete and the coolant needs to be drained and replenished every couple of years. It is a tried and proven chemistry that provides a fast acting protective film.
This is the traditional coolant based on inorganic additives and is called inorganic additive technology (IAT). There are two basic types of coolant available today dependent on the corrosion inhibitors used: A 1:1 dilution with water is usually used, resulting in a freezing point in the range of minus 37 ☌ to minus 42 ☌, depending on the formulation. Most commercial antifreeze formulations include a glycol (to suppress the freezing point and raise the boiling point), corrosion inhibiting compounds and a coloured dye (commonly orange, green, red, or blue fluorescent) to aid in identification. The use of antifreeze protects against both problems.Īntifreeze not only suppresses the freezing point of your engine coolant, but provides good corrosion protection and increases the boiling point during use.
Not all antifreeze / coolant is the same!Ĭoolant can be plain water water is a very effective coolant but would not protect against sub freezing temperatures or protect against corrosion inside the engine. To help clear some of the confusion up on the more technical details of antifreeze and coolants we enlisted the help of Martyn Mann – Technical Director, Millers Oils UK - who has provided the information below. Basically, they’re the same product (although the term “coolant” could just be applied to plain water see below!) Perhaps the most frequent cause of confusion is what the difference between anti-freeze or coolant is. Coolant and antifreeze is a topic we are asked about on a regular basis, and often causes confusion types, colours, service life etc.
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